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After decades of keeping the Kardashians’ secrets under wraps, Kris Jenner’s younger sister, Karen Houghton, is breaking her silence and revealing what really goes on behind the closed doors of her sister’s reality empire.

In an exclusive interview with In Touch, Karen reveals the truth behind Kris' rocky relationship withBruce Jenner: “[Kris and Bruce] are separated,” Karen confirms to In Touch, adding that he has “sought out a lawyer.” But despite their separation and frequent fights, Kris and Bruce “still do things together,” says Karen. “Their relationship goes back and forth. I would love to see them get back together.”

While Kris herself has admitted to cheating on her late ex-husband, Robert Kardashian, and straying at the beginning of her relationship with Bruce when she slept with an ex, soccer player Todd Waterman, Karen says there are whispers of even more inappropriate behavior.

But the whispers don’t end there. Before he was accused of murdering wife Nicole in June 1994, O.J. Simpson would get “flirty” with Kris at parties. Now O.J. — who’s in prison for unrelated crimes — “has been trying to contact Kris from jail,” Karen tells In Touch.

Karen, known as “Crazy Auntie K” to her famous nieces and nephew, "knows where all the bodies are buried. Her talking is Kris’ worst nightmare,” says an insider close to Kris. That may explain why Kris keeps her sister away from the reality cameras — but lavishes her with gifts.

“She sent down a Mercedes for Valentine’s Day. I went out front, and there was a big bow on it,” reveals Karen, a part-time nurse and single mom to daughter Natalie Zettel, 15. “She also furnished my whole house [in 2009]. A truck came down with $50,000 worth of furniture.”

Kris may be “generous and giving,” says Karen, but she’s also “crazy and controlling."

Read the full interview with Karen sharing the Kardashian's darkest secrets — including details inside Lamar Odom’s recent drug scandal, Kris’ epic clashes with Kanye West and more — in this week's issue of In Touch, on stands now.